#1 Confetti
Confetti is cheap- great, cleaning up is not so great.
#2 Flower Petals
Very pretty and versatile which is great however the cost can be not so great.
#3 Bird seed
If your outdoors you may not have to clean up- very great! Not so great is bird-seed hair or bird seed dust.
#4 Rice
Pretty and traditional is great but the clean up? Not so great.
#5 Silly String
Very fun is great but silly string stuck to your clothing and in your hair- not so.
#6 Ribbon Wands
Great for photos and fun with no clean up but who will make them all?
#7 Fall Leaves
Fall leaves as confetti in Fall, great as it's natural, not so great if they're dirty...or buggy.
#8 Sparklers
Great if your getting married in the evening, not so great for safety in a small or overcrowded space.
#9 Bubbles
Makes for great photos, can not be great when burst over nice clothing.
#10 Balloon Releasing
Exciting and unique so great right? Not so great for the environment.