Try to build up a little arts and craft box full of prit stick type glue (less messy) and little things to stick onto it, you could cut up shapes of paper and I also like to cut out the initial of their name and as they get older you can use the other letters to help with letter recognition.
I cut circles and features so that they can put the eyes, nose and mouth in the right place, we also made an Ox for the Chinese new year where they had to put the horns, eyes and nose and we stuck it on a stick for a mask.
Also, real stickers are nice, especially for younger toddlers who find the glue stick tricky.
The important thing is that they do it as they want to, not how they should (IYKWIM) you can sit and do what you should do and they can watch and learn, but if they don't get it right, that's fine,it's their work and they will get it right soon. I was in a playgroup when a mum was trying to stop her son from twirling the heart shaped cutter around in the playdough, she was taking it off him and showing him how to do it correctly, he just wanted to twirl it around. But he was having fun, who cares if he wasn't making hearts, he was making lovely swirls! Let the children lead you!