My first toy was the back of a thick toothbrush which made me fall in love with anal play. After that I wanted something bigger and I started using a candle, the back of a hairbrush or a small cucumber with a condom.
But my new favorites are what I bought today:
3 big marbles (about 3,5'' in diameter) and put them in a sock then a condom. (Amazing!)
A glow in the dark foam stick, 9'' long and 4'' in diameter!! (OMG!)
Its just as firm as a hard cock, so its like a very cheap, very BIG, glow in the dark dildo =P
I also found a pretty big twisted dog toy with a ball on each end that looked very temting, but i was already satisfied with what i had.
(maybe next time)