How do you change the color of signal bars and Wifi icon on iPhone 4?

[bobright]

so ive seen a couple people with the color of the signal bars and wifi icon in different colors, how can i change that? can i do it via cydia and if so what package?

for instance see the color yellow/green here:

[Simon]

Probably winterboard was used for those tweaks

[smokepsp32]

yah me too, i would like to change my wifi icons on my iphone3gs