Thoughtful framing and placement helps avoid chaos when you assemble an array of antique photos. Search flea markets, antiques stores, and discount stores for inexpensive frames in various shapes, styles, and sizes.
Paint can unify different looks in frames. Consider a few rounded frames to help soften frames with right angles. Professionally cut-to-fit mats can help preserve your pictures and set them off from the frame as well.
If you have mats professionally cut, this project can be done in about a day by a beginner.
Expect your costs to run about $50 to $100 for frames; add about $15 for each professionally matted picture (or add about $50 for mats and a mat cutter if you do it yourself).