I'm writing up a little doo-dad that will let you put thumbnails of images stored in flickr in you sig here on NAM.
First off, if all you want to do is put a specific picture's thumbnail in your sig, that's easy... find the image in flickr, click on the "All Sizes" button on the images page, click on the "thumbnail" link, grab the URL from where it says "1. Grab the photo's URL:", and put it inside an [img] tag, so it looks like this:
[img]http://static.flickr.com/5/9845471_703350e9e7_t.jpg[/img]
That will put a specific image's thumbnail in your signature (or in a post, for that matter). Great.
But, what if you want your signature to always contain your most recent upload to flickr? Here's what you can do:
[img]http://joshwardell.com/snid/flickrSig.php5?u=
username&n=
number[/img]
where
username is you flickr username, and
number is how far back in your photostream to go - 0 is the most recent photo, 1 is the photo before that, etc - I think you can only go back to photo 9... trying 10 breaks things.
So, as an example, [img]http://joshwardell.com/snid/flickrSig.php5?u=snid&n=0[/img] would load my most recent flickr upload's thumbnail. Like this:
Doing a sig like this:
[img]http://joshwardell.com/snid/flickrSig.php5?u=snid&n=0[/img] [img]http://joshwardell.com/snid/flickrSig.php5?u=snid&n=1[/img] [img]http://joshwardell.com/snid/flickrSig.php5?u=snid&n=2[/img] [img]http://joshwardell.com/snid/flickrSig.php5?u=snid&n=3[/img] [img]http://joshwardell.com/snid/flickrSig.php5?u=snid&n=4[/img]
will display my five most recent uploads:
No we're getting somewhere... Josh said "how about a random photo?" Alright, use "r" for the
number, and you'll get a random photo. Like this: [img]http://joshwardell.com/snid/flickrSig.php5?u=snid&n=r[/img]
Like this:
Unfortunately, if you try to put a bunch of random photos together, they all wind up being the same. Like this:

There might be a way to fix that, but it doesn't work right now.
Since Juan created the northamericanminiacs group in flickr, I decided it would only make sense to work with groups instead of users if you wanted to. So, you can make URLs like this:
[img]http://joshwardell.com/snid/flickrSig.php5?g=
groupname&n=
number[/img]
Notice the use of
g instead pf
u. For example, this will grab the most recent upload to the "northamericanminiacs" group:
[img]http://joshwardell.com/snid/flickrSig.php5?g=northamericanminiacs&n=0[/img]
Like this:
Or, a random picture from the group:
[img]http://joshwardell.com/snid/flickrSig.php5?g=northamericanminiacs&n=r[/img]
Like this:
but there's still the same problem with trying to get more than one different random picture at a time.
I'll probably add some more goodies in the future, like stuff to let you make the pictures be links to the picture in flickr.
The biggest problem with using this stuff as a signature here on NAM is that signatures are capped at 300 characters, and URLs are kinda long.