Cool colors generally consist of blues, greens, pinks and purples. Blue-greens, magentas, and blue-based reds are included too. A cool pink is a purplish pink (as compared to a peachy pink). A cool green is more bluish (as compared to a green that is more yellowish).
I preferred filling Chasing Edwin from the 2009 Magnolia Stamps Chasing Butterflies Collection using cool blue-greens for his shorts and kept the rest of this image very neutral, using beige colors.
With this sentiment from Stampin' Up!'s Friendship Blooms (2008 Sale-a-Bration set), this pretty little card is ready for a "cool" display. Here's a front view of this "cool" Side-Step card . . .
skin: E000, E00, YR00, R20
hair: E31, E35, E47
Edwin shorts: BG72, BG75, BG78, BG000
shoes/net/belt: E43, E44, E49
shirt/sock: E40, E41, E43
netting: E40, 0
ground shadow: C5, C3, C1, 0
Tilda dress/hair bow: R81, R83, R85
grounding shadow: BG000, 0
Butterflies: pink-R81, R83, R85
purple-V04, V05, V06
blue-green-BG000, BG72, BG75