Color Swap

Andrea proposed a color swap taken from Embellish Magazine. At the last minute, I decided to play and came up with this combination of an Impression Obsession stamp and Sparkle N Sprinkle EPs and Glitters. Unfortunately, the true nature of Fantasy Gold glitter doesn't show up in my photo, but maybe you can get an idea?

The base shape of the card was created using the largest of Spellbinders Mega Nestabilities "Curved Rectangles" S5 006 and my Grand Calibur die cut machine. A green colored pencil outlines part of the flower. 

Since this is my first Color Combo Swap, I tried sticking with the suggested colors, but it really needs a splash of something light in it! So my question is, when doing color combo challenges, are we allowed to use white (especially for images) or are cardmakers supposed to use only the suggested colors?

Thanks for visiting.