What do you guys think of mixing lights? I got some multi-colored ones on clearance, and already had 2 packs of clear. (My ornaments are red & green.) My tree is 7.5 ft tall. I just got it on clearance too and I am not even sure how many lights it will need to look good. Probably more lights is better. But are there any specific guidelines? I want to get all I need right now, instead of waiting til fall and paying full price!