you cut out your logos into the size blocks you want to use, purchase lightweight woven fusable interfacing (not paperbacked fusable) place your 'blocks' face down on a press cloth (i just use a piece of muslin) it does not take a really hot iron to attach the interfacing, just follow the instructions that comes with the interfacing. and you press...don't iron...as in pick the iron up and place it...do not slide it across the blocks. i have made i think 8 t-shirt quilts, have never had a problem melting the logos, just turn down the heat a little bit and always use a pressing cloth.