Cool idea Karen!
I would have to say my first would be the changeable backgrounds of the room like Ultimate Bet. From a breezy trpoical Aruba, to a Vegas skyline background.
I really like the avatars from JetSet with changeable faces and expressions.(also their custom ones are cool) And even their custom chat feature you can change the mood that you are in.
I would have a cross between Titan and UBs hand history. Both are pretty good and infact these days I think Titan maybe be a bit better than UBs. it doesn't start over when you get moved.
Like you Karen, I like the feature of the bet, check or call sound effects. I would even throw in the rabbit feature like Poker.com I would also have a better betting slider than some sites have that's a bit more accurate(even typing it in alittle easier)
I would have a good choices for ring games and MTT.
From 5 card stud to 7 card stud with h/l mixed in. Even 2-7 triple draw(I would like to learn that one) Maybe a few more micro NL tables and a vast range of MTT and SNGs thrown in for good measure. Also would have low buyins step tournaments for bigger tournaments with a limit of 1000 players. Like for the WSOP
, WPTs etc....
And just being silly, a special feature that when you get sucked out on the river a few times by the same player, that you can have a loud squeeking sound like a rat or a sucking sound that all the players could hear. Taking that one step further would be sound effects of a flushing toilet for a flush, a motor boat for a full house. a thud for Trips, etc........ Of course with player option to turn off if it gets annoying