these are some felt ball ornaments that i made a few years ago. they were very easy to make, and turned out pretty much exactly the way i imagined them (which does not always happen!).
they are solid wool balls, made by hand with the finishing step of throwing them in the dryer, which makes them firm up and become very dense with a uniform surface. sadly, i have no dryer here in japan, so i haven't made these for the last few years. after the wool ball is made (and you can use any wool for the core, a cheaper wool or a color you want to get rid of), i used needle felting to apply the motif. which is super super easy--using a felting needle to needlefelt onto a solid felt ball is a very straightforward technique!
i don't have a tutoral for these, but there is a good basic video tutorial that i referred to when i first tried making large felt balls is here, from the crunchy parent on youtube.