Sometimes on foamboard, if I have the time, the heat-activated, otherwise it's spray mount. For canvas, it's either a gallery-wrap on a frame or to the heat-activated foamboards, up to 40x60. Other times, I use 3M poster clips on the wall or even push-pins if the wall allows their use. I just don't have the budget, time nor space to frame these images unless it's for a commission and someone else is paying the bill!