Tutorial
Levitation/Slice in Picmonkey.

See this photo for reference: www.flickr.com/photos/61241921@N07/7784564762/

Picmonkey is a great program as far as it goes but is by no means the best way of editing photo’s, it is limited by its Java scripting and this leaves a lot to be desired in terms of precision. For those who really want to get into real image manipulation you should be looking at Photoshop, photoshop elements, paintshop pro, or the best one (coz it’s totally FREE>>>) Gimp.
Here’s how to go about it in Picmonkey;

First locate and gather your images, you need two- A photo of the background without your subject and props and one with the subject. You need to be able to take the photo’s without moving the camera so a tripod will be very useful along with either a remote shutter release or the self timer facility... it is vital that the camera does not move between takes. If you don’t have a tripod you can place the camera on a sturdy surface.

www.ipernity.com/doc/313629/23508477

Now upload the two images into Picmonkey, Background image first. In the example here I am just using a pure black background (but in the shot of katy levitating it was the garden without her posing) The Banana slice image as you can see is pretty much self explanatory as to how it is done
First upload the background image
(Plain black background works well)
Then download the second image, this will naturally appear on top.
(Photo of say a banana and slices on a stick)
To download the second image you must locate the Overlay button in the left hand toolbar and click the ‘Your Overlay’ button- This will open a navigation pane where you need to find and double click your secondary image, this will open to this screen;

www.ipernity.com/doc/313629/23508479

Now you need to re-size the image to fill the screen by moving the overlay image down so that the two sides line up in a corner then grab the opposite corner handle and pull it up to fill the editing screen. You will notice there is now a dialog box that has appeared with some more options. Under the Basic tab there is a Fade Slider, slide this to somewhere around 30-50% so that you can see what’s happening as you erase the parts you don’t want to see. Now from the same dialog select the Eraser tool and start erasing the cocktail stick (or whatever it is in your image... a chair, stool or stepladder- whatever). You may find it useful to expand the image to allow the more detailed work with this tool, you can do this by clicking the zoom control in the bottom right hand corner of the screen (highlighted in red in the first image above). Depending on what image you loaded first dictates whether you hide or expose the unwanted parts of the image, in my case the background went up first so I exposed the banana and hid the cocktail sticks.

www.ipernity.com/doc/313629/23508483

If you make a mistake and erase the wrong thing you just have to select the brush tool from the same pallet and go over the mistake and it will recover Adjust the zoom and resize the brush to allow the detail work.

www.ipernity.com/doc/313629/23508487

In my banana shot there are certain area’s where we can’t erase the cocktail stick because they do not fall onto the background layer and these can be tackled with the Clone tool. Go to the effects tab (the flask) and scroll all the way down to the advanced section (that’s right, you are now promoted to EXPERTS!) and click the Clone tab. This will only work though if you subscribe to Picmonkey as it is one of their ‘Royal’ features!
Now you need to zoom in really tight on your image. You need to select an area for the clone tool to copy and you do this by clicking the ‘Source’ button then click an area near to and or similar to the area you want to cover up. Now when you click on the area you want to hide it will be replaced by the bit you just sourced. You may need to practise this a little bit as you will find it best to ‘source’ several different areas to get a realistic effect. Once you are happy go to toolbar at the top of the screen and locate the layers toggle which will merge all the layers together and you can then save your image.

Here is a link to an article showing you how a levitating shot can be achieved in PicMonkey, a free editing/post processing site, and goes through much the same steps as Nigel described above.
submarinesandsewingmachines.blogspot.nl/2013/02/diy-learn-to-fly.html