Funny thing I noticed; some of Prestidigitation's effects affect an area, meaning that when combined with Snowcasting, you can apply Flash Frost to it.
Coat things in a small area with ice! Deal 2 cold damage! Counts as a 1st level spell!
Also, you can throw Arcane Thesis and Metamagic School Focus (Universal) onto the build, for a cantrip that
a. counts a first level spell
b. Allows you to smack someone within 10 ft with a negative level.
c. You can do b. every round for an hour.
You can also apply Sculpt Spell to Prestidigitation, due to parts of Prestidigitation having areas of effect. Think about that for a moment.
Of course, I'm most probably wrong, but what could be the harm of Cleaning/Soiling everything in a 100' line?
Or in a cylinder?