I am looking for some new houseplants that are either cool, pretty, rare. or exotic.

I now have: caladiums, some cacti, aloe vera, venus fly trap, shamrock, mother-in-laws tongue, and donkey tail.

Do you know of any other plants that do well inside all year round?

If you won't something with a bit of height then get a Chinese lucky plant. When it gets to tall all you do is cut the top off and replant it.
http://www.jarrettservices.com.au/plants/varieties/happy.asp

Another nice indoor plant is Peace Lily.
http://www.plant-care.com/drooping-peace-lily-spathiphyllum.html

If you like to add some colour then get a Cordyline fruticosa
http://www.floridata.com/ref/C/cord_fru.cfm

one more easy care indoor plant is a Philodendron called 'Xanadu'
http://www.wschowa.com/abrimaal/araceum/philodendron/xanadu.htm