Butterfly cutouts - You can look for butterfly images in old books and paper ephemera and photocopy them, or alternatively, many etsy sellers offer digital collage sheets that you can print multiple copies of at home and cut out.
Tags or small cards - You can purchase ready made tags at craft stores, or if you'd like a more custom look you can make your own from your choice of cardstock and a tag-shaped paper punch (about $10-15 at craft stores). You can also opt for simple rectangles, cut easily with a paper cutter.
Mini clothespins - Found a craft stores
1. Glue mini clothespin to back of butterfly cutout as shown and let dry.
2. Write guest names and table numbers on tags.
3. Use the butterfly clip created in step one to fasten the tag to desired display.
Hang butterflies on a clothesline in alphabetical order.
Clip to groupings of twigs or branches in vases and label each vase with "Surnames A-D" and so on.
Cover a flat surface such as a bulletin board with old book pages and clip butterflies along edges of overlapping pages