Use colorful tacks for convenience.Buy some colorful plastic tacks and use them to hang your photos. Or, brush some craft glue on the tops of some metal push tacks and sprinkle any color glitter onto them. Allow these to dry, then use them to pin your photos directly into your walls.
To create a gallery, use the same color glitter on as many tacks as you need to hang multiple photos in the same area.
Tacks will put holes in both your walls and canvas prints, so make sure you are okay with this before using them.