I usually do my card with 2 types of paper, one is the half transparent paper (some call it vellum paper, parchment paper, tracing paper....etc) which is where the design is done on. The other color paper is place inside as the inner paper to write personal message of the card.
here are the inner color paper available:
here are the inner color paper available:
As for the vellum paper, usually is in white (non color). but I manage to find some colored ones too. it's very hard to get so I will use it very wisely. Currently these are the colors I have.
you can refer to my previous post, the Christmas bell and the love shapes card is the one using color transparent paper number 2 and 3 accordingly. The rest are the white (non color) vellum paper with different inner color paper.
