Since I don't know much about lichen, I can't give you a species on these. I've posted them to iNaturalist in the hope that I might get some answers, but for now, I'm just enjoying their different forms and colours.
I'm not entirely sure, but I think the small brown circles might be another lichen species growing on top of the greyish-green one.
I think this one might be called varied rag lichen, Platismatia glauca, but I'm not sure.
I thought this was really beautiful - it's a small moss cushion that has lichen weaving through it. An interesting specimen.
This seems to be the most common type of lichen in my woods, and I believe it is in the shield lichen class, but again, I'm no expert!
It was a lovely day (for a short time) to be outside and wandering amongst the trees, but it soon clouded over and became grey and cold again. I'm glad I went out for a short walk.