I'm collecting onion skins too
My OH threw out the last lot on the grounds that I had been collecting them for ages but hadn't used them yet
. You can speed up collection a bit by filling your bag of onions at the greengrocers with all the fallen skins in the bottom of their tray.
The logwood is glorious, the lighter colours anyway. I think that grows in the States doesn't it? I don't think we have anything which isn't fugitive ie fades quickly, in this country to give such a colour. Blackberries and elderberries do give a lovely colour but it doesn't last
You are inspiring us all to get dyeing too Sally