the background beams (I like the terminology-- sounds much fancier than "lines"
) were painted on with a semi-gloss latex, then the stickers were applied over top--you could do it all on the stickers but for me it was an evolutionary process and there were several months between the beams and the pics. In hindsight--all in one step would be the way to go--just make sure your ink catridge is nice and full before you start
Oh ya cost--i think it was 11.95 for a pack of 20 8.5"x11" sheets and i used the whole thing for each side so 24.00 total for both sides of sideart (plus the paint which was a mistint at homedepot--can you say uber bargain hunter!)