Take a coloured card blank. I used a bright blue from the Pollen range of Clairefontaine. These are really good if you want instant colour and a change to the usual white or cream card blanks.
Cut a piece of co-ordinating paper slightly smaller than the card size and stick down with either Spray Mount or double-sided tape. The piece I used was some green Lokta paper that was left over from the card-making kit. Waste not, want not!
Add embellishments of your choice. I have gone with Papermania Pop up Accessories and a lovely range of felt letters from MIC. Each piece is stuck on with an adhesive foam pad to give an interesting 3-D effect.
Simple but I think quite effective.