My first tut so please be nice :)
>>
in PS CS2
Step 1. Crop your base and resize it to 100x100
Step 2. Layer >> New Adjustment Layer >> Curves
RGB
Input 127
Output 215
Step 3. Layer >> New Adjustment Layer >> Curves
RGB
Input 44
Output 62
Step 4. Layer >> New Adjustment Layer >> Selective Coloring
Reds -67/-38/-33/+34
Neutrals +80/0/-18/0
Step 5. Layer >> New Adjustment Layer >> Selective Coloring
Reds -46/+35/+27/+60
Yellows -54/-65/-49/0
Neutrals +12/-20/-18/-14
Step 6. Layer >> New Adjustment Layer >> Selective Coloring
Reds +13/+19/+19/+12
Neutrals +29/-4/-9/+6
And you're done :D Other icons made with this tutorial: