The yahoo group ArtTechniquesATCs is holding a monthly colour swap. I participated in the blue swap and should be receiving my trades soonish. Since then there has been a red and a yellow swap. I have made cards based on these colours but have not officially joined in the swaps. For each I have tried to only use the colour specified - which isn't always easy!Broken Hearted was created for the red theme (obviously) and uses the nail polish technique to create the heart.
I think of yellow as being a very happy colour and thus Happiness in Bloom was created for this theme.