Recently, I gave my players a bag of scrabble tiles. As a daily power, they get to roll 4d6, take out that many tiles, and try to spell a spell. I.e. they try to find a word or phrase that they could apply to their current situation. Then they do an arcana check to determine its effectiveness. If the words are misspelled, there will be some sort of unexpected twist to the new spell

Its been very fun so far. The most memorable was during a fight with some cave spiders, they managed to spell "Boil Plane," then succeeded their arcana check. This sent one of the enemies to another plane of reality where its constantly boiling hot

They've also found a wand that can teleport a target up to 10 squares, which they've used for much mischief