For my boxes I used BoBunny, Bazill and some older cardstock, whose maker I can not remember. I also included A2 sized cards made with some of the same cardstock. Use the STRONGEST adhesive you have for this as it is hard to get some of the small box parts to stay put. Especially if you use a gllittered or embossed paper as I did on the blue one.
I used a "One Sheet Wonder" pattern for this. What is a One Sheet Wonder? you ask. These are patterns for cutting one sheet of cardstock into many specific sizes rectangles and squares that are used to make 10-20 cards quickly. By cutting two or three coordinating papers in similar shapes and sizes you can mix and match to make a fun set of cards. Just finish off with some embelishments, such as stickers, a stamped phrase, or a flower or two. These sets go together quite quickly and make for a fun gift. I am sorry I don't have a link to the OSW I used. I couldn't find this as a was getting to post. I will find it and post at a later time.