I'm starting to build a bit of a collection of crafting cd-roms after initially not being such a big fan of them. I've been won over by the idea that once you've got them, you can print as many designs as you want and actually really make them great value for money. I recently got the new Crafters Companion 'Christmas in Mulberry Wood' cd-rom which is just £14.99 on their website http://www.crafterscompanion.co.uk/. It has all the usual Crafters Companion cd features including backing papers, inserts, decoupage, toppers, writing papers, envelopes & more and has lots of very cute woodland creatures getting ready for Chrismas.
I have used both the backing papers and the decoupage to create this card.
If you are making easel cards then Card Candi is a must have and don't forget that you can just buy a white set and colour them with your promarkers or spectrum noirs. Stamping them is also a great way to theme them to your project and there are special Candi Stamps available (I'll hopfullu soon have some pictures to post of the cards I've made with my new set!). You will want all the pre-coloured ones (and patterns, foils etc.) but they are great value anyway!