I have an Ikea potty chair for the beginners...it's all one piece of molded plastic that comes in fun colours. I like it because it's small and very easy to clean. It tucks in behind the toilet in my powder room when it's not in use.

When I'm not doing daycare, it tucks into the cupboard of the sink vanity.

For those who prefer to use the regular size toilet (my preference, and I encourage it!), I use this toilet seat on my toilet. http://www.canadiantire.ca/AST/brows....jsp?locale=en

It's a toddler-size seat attached to the regular toilet seat. Mine is slightly different...it's wooden, but the idea is exactly the same. I love it!! Mine snaps off so I can put the whole seat/lid combo into the tub to clean and put back onto the toilet easily.