I have MacsMoms recipe for her strawberry wasc, but it uses 2 box mixes, 2 cups flour, 2 cups sugar AND 1 1/3 cup strawberry daquiri mix

can i sub pureed strawberries?

I'm sure you could. It would probably be pretty delicious.

Any flavor of cake can be made using different flavored cake mixes or extracts, etc. and the basic WASC cake recipe by Rebecca Sutterby:
(Including using frozen pureed berries.)

http://tinyurl.com/2cu8s4

HTH

you can, but I find that real berries turn the cake a brownish pink color.