craftgrrl | Pouring resin to make magnets?

My awesome friend bought me these Frida Kahlo stickers. I've been thinking about how I want to display them, and I decided they would all make great magnets. I have experience with pouring/poured resin (Envirotex, specifically) but not with actual molds and putting resin in molds. After attaching the stickers to a strong backing on which I would later place the magnet, could I just turn the stickers face up and pour resin on them? I've done this with larger paintings and collages, but never with anything this small. Each sticker is about 2inch by 1inch.

ETA: I'm asking if this can be done WITHOUT molds, and instead use the Envirotex Pouring Resin, like some people do with paintings and collages (I've done this myself, with a larger painting on wood panel).

And so that this entry isn't image-free:

This is a project I did over the summer in a fibers/dyes class (I'm an art student, specifically drawing and painting, but I took that class as an elective). The dyeing technique is shibori on silk. I then stencilled on the imagery of the Greco-Roman goddess Artemis/Diana and the deer, and then cut out the right pieces to stretch around some wooden frames to make 3 panels. Sort of my homage to mythology/history painting.