Can I ask something that might be really obvious - what do you use as a base for your cards? The only cards I've ever made were a set of new home cards made with some plain white cards about 4x6ins. I'm really impressed with the cards I've seen on here and in some magazines but was wondering what people use for a base. Do you use ready made cards (though I guess you'd need a range of shapes and sizes) or just cut cardstock into the right size/shape (but that would get quite irritating if you wanted a lot the same)?

Thanks for your help!