So much to choose...so much to lose...

Um...I am kind of in a state where I'm torn between many ideas of my SRP. So...what do I choose?
I seriously have no idea. Actually, I have quite a few ideas, but that's the problem:
WHICH IDEA SHOULD I CHOOSE?

So far, these are my ideas:

• the effect of music on plant growth
• do all types of liquid expand when frozen?
• which substance removes graffiti the fastest or bestest?
• do plants grow faster in soil or in water?
• more ideas will be blocking my train of thought and relief

So you see, I'm really trying to choose an idea. I'd like to inny-minny-miney-mo, but I can't. That's just too risky and childish, anyways.

Please let me choose something by, like, tomorrow!