Do you love the look of mesh on layouts, but cringe at the cost? I use the mesh drywall tape! It's really inexpensive, already has an adhesive backing, and it can be painted or inked or chalked to whatever color you want. You can tear it, distress it, thread ribbons through it and more.
I've also used it as a "stencil" by sticking it down on my paper then dab an ink pad over it. Pull up your mesh and you have a great pattern, good for a background, a photo mat, or anything.
Its really cheap for a HUGE roll. You can get it any home improvement or hardware store. Lots of the big chain stores sell it also.
I haven't tested it for acidity, though, so if that's an issue for you, you may wish to check it out or refrain from placing in direct contact with your photos.
(My husband is a drywaller and hates the stuff for drywall, so he doesn't steal it from me..... tee hee hee)