These donkey stamps seem to be pretty popular and they are certainly fun. Today I've gone for the one which is frolicking around, starting by deciding what size of square he would be on and then working out the text on the computer. The donkey and balloon were stamped and fussy cut. I then used a splat die to make myself a stencil so that I could ink through to give him a bit of background, finally adding more splodges using a stamp.
Donkey - from Darling Donkeys set Stampin' Up
Balloon - stamp from Balloon Celebrations Stampin' Up
Words - produced on the computer to fit the square
Square - die from Phill Martin
Inky background - stencil made using Sizzix Splat die
Extra splodges - stamp from French Foliage Stampin' Up