I obviously think they're super lame. You?
Unsolicited redesigns are just a way for young naive designers to flex their visual muscles. If you are wanting to do this to showcase your ability to use Photoshop, sure go for it! To think that it is a viable solution for a large company that it can be used in the real world your are living in a dream.
There are larger initiatives behind many product decisions that are beyond most anyone outside the company, to promote yourself with an unsolicited redesign is not very good practice and may detrimental to your career than you may realize.