Great thread! I just made my first yeast starter about 8 hrs ago. Its about 1 AM, and I was a little nervous, because I haven't seen any bubbling or krausen yet. So I went online, found your pics, and see that mine is starting to lighten in color like your "17 hour photo." Peeeerrrrfect. I was nervous because i was looking for krausen, but now realize that a changed coloration means that new yeast is being formed.
Sadly, i have been only been home for minimal hours the past couple days, so I will only have 24 hrs for my starter to prep. Its OK though- I made 2 quarts of starter for a 5 gal batch of Tripel, OG expected to be 1.079, and I am using Wyeast Trappist High Gravity yeast, so I should be fine.