Pretty easy and simple to do, as long as you have the stencils! I brought mine last year from poundland part of a set to spray images on your windows.
Prepare your area, newpaper needed and put some inside the top flat.
Start mixing the paint with a little water, i used a sponge to mix it and also dabbed the paint.
Tape the stencil to your top, make sure it is flat. Then you wanna start to lightly dap on your paint with a sponge. Make sure your paint isn't too thick or too watery. Only dab on small amounts at a time, then you can build it up.
Half way there, I decided to add some more smaller bats. Try flipping your stencils over, so you have more images, but make sure they are dry first!
Wait to dry and its ready to wear :) Altogether this top cost me Â£4.50!