A quick little project I did this week was a Paramecium. I've always wanted to cuddle a protozoan, and now I can. He's made out of a white fleece from IKEA, and the Cilia are/is actually the frayed edge of the fleece. The vacuoles etc. are made out of scrap bits of fabric. Ow and it also has a Cytostome.
He's about 20 Inches long and filled with polyfill.
Actually the simplest project ever, especially if you leave out the Cytostome.