I made some more flowers from aluminum cans and plastic soda bottles.  The two larger flowers on the left and the two plastic ones on the top right I used alcohol inks for the color.  The bottom right I used regular spray paint.  Kyron seems to work the best.  Its really best if you put a coat of primer on first, otherwise the color tends to want to run.  Also you need to careful not to put too much spray on at a time.  This causes the paint to crackle.  I really like the alcohol inks.  They coat well on both the aluminum and the plastic.  The alcohol inks can be a bit expensive.  $10.00 for three .5fl bottles, but if you get them while they are on sale or use a coupon its not so bad. I just picked up 3 for $6.35 today at Michaels.