Hi, I do the same with vellum. I print loads of pictures out then I also put clear embossing powder on top great results.
Also if you print on vellum in black (sentiments etc.)
then if you are quick you can use gold and silver embossing powder over the top. Hey presto black is covered. Best to use A5 though as not so much to cover before ink starts to dry.
Good for Wedding invites too