If you've got a box of All Bran that you don't like and just want to use up, then by all means crush it up and add it to your yogurt, or your baked goods, or use as a breading. I've never tried grinding it - just putting some in a baggie and crushing it has worked fine.
If you're looking for additional fibre and you don't like All Bran, then I'm absolutely with WADINGMOOSE that you should look for it in foods that you actually do like. I personally prefer adding oat bran and / or wheat germ instead of wheat bran, since I prefer the taste and texture. My Mom prefers the Bran Buds. It really is a matter of personal preference.
If you want to see foods high in fibre, then you can check out the following: www.ars.usda.gov/Services/docs.htm?docid=2
If you're concerned about soluble vs. insoluble fibre, then I like this one: huhs.harvard.edu/assets/file/ourservices/s
Hope this helps!