We all love bowling, don't we? There's a free bowling game for Blackberry phones available, and this one is called Disco Bowling. Besides working on Pearl 8100, it also works on older version of Blackbery phones.
There's another nice theme for the Blackberry Pearl 8100, and this one is FREE :) Chalk 2D Today Plus free theme will remind you to good old school memories. The theme also works for other BB phones too :)