I do some of them, if they somehow aren't in a PDF file or the picture alone isn't self-explanatory. Otherwise, I have a file on my computer called quilt ideas. I save pictures and pdf files to it. I also have book marks and put them in a folder called quilting and sewing ideas.
But I find that sometimes blogs quit being on line or those links get old and expired. So, actually printing them out or saving a pdf or jpg file to your own computer or your cloud would be the best way to keep them, if you want them for sure.