Red Velvet Poke Cake--Very tasty and cheap to make. I used Duncan Hines Red Velvet Cake Mix, Jello Cream Cheese pudding, and Cool Whip, and it was still only a few bucks to make. The cake has to cool/set in the fridge for about 2 hours.
In a small Ziplock bag: cup half and half (milk works too), 1 Tbsp sugar, 1 tsp vanilla. Insert that bag into a gallon Ziplock filled with ice and salt. Shake the bag for five minutes. Then remove the smaller bag which should have turned into ice cream!