DIY centerpieces

Has anyone made thier own floral centerpieces. if so where would you get the flowers and could i have someone deliver them to the RH and they will put them together for me?

I was thinking of ways to save money and was origionally going to do candle CP but now im having a day wedding and will do floral.

I posted pics in my album of what i like. is this possible or am i out of my mind?

i am pretty crafty but have never tried floral arranging, figured i could copy?