Poker night was last night, and we came up with a texas hold-em variant that was sort of fun:
Each player is dealt three cards. After looking at these cards, each player chooses one, and it is placed face down in the center.
Small blind/Big blind as normal. Initial betting.
Mix these cards up (we actually used a six sider to determine whose cards were chosen), and flip three. This is the flop.
The rest of the gameplay is normal texas hold-em rules.
The turn and the river come from the deck (unfair otherwise).
If you are down to two players (tournament play?), the third card for the flop comes from the deck.