I'd second Scott Miller, Emmanuel Butler and even Blasingame (since he's a nice talent). Some others that might be worth a stash (I'm assuming any reasonably highly regarded rookies are still rostered - e.g. Campbell, Harris, Isabella, Butler, Wharring, Sternberger etc):
Dwayne Washington - didn't take his chance with the Lions in his rookie year but has looked good with the Saints whenever he's had an opportunity (a couple of times). He's a FA so could go to a better situation, but realistically I doubt he'd attract much interest, especially with the incoming rookie class. Nice talent though and great athletic profile.
CJ Prosise - also a FA I believe. This ship has likely sailed, but you never know. At least he has stayed healthy this year and looked decent. Another team might take a shot.
Damarea Crockett - remember when he had some hype? Not a good sign that no NFL team has bothered to sign him off the practice squad, but he's capable and teams always need RBs so maybe he'll get a shot somewhere.
Jeremy Cox - talented UDFA who the Chargers didn't show much interest in once they signed him. Only for the deepest of leagues, but if he finds his way onto another team, worth paying attention to.
Dontrell Hilliard/D'Ernest Johnson - not sure what the Browns' plans are for Hunt, but these two have both played well enough that they should get an opportunity elsewhere if there's no room for them.
Steven Sims Jr - probably my favourite stash. UDFA who already beat the odds to not only make the Redskins active roster from a nothing college program (Kansas) and even get meaningful playing time some weeks. His stats don't look like much, but they're starting to give him a few more looks and the fact that he's been involved in the offense AT ALL this year and had a handful of highlights I think is encouraging, given where he came from. The downside is that he may always be seen as a 'gadget' player (even though I think he can be more), and he still has to really beat the odds to be successful as a UDFA with an underwhelming athletic profile (even though he plays faster than his metrics). The other negative is that Dwayne Haskins is horrible and it's going to be hard for any Redskins pass catchers to have consistent fantasy value with him under centre (and unless they get a more creative coaching staff on board next year, which seems unlikely). Still, I'm a big fan.
David Moore - I believe he's a FA (restricted) after this season and he's shown enough in limited usage with the Seahawks to draw interest in a more dynamic passing game.
Javon Wims - I have no idea why this guy doesn't play over Miller and Gabriel (at least Gabriel) because he looks fantastic whenever he's on the field and the Bears passing game is a joke. No indication the Bears will get smarter with him, but he's a real talent and those are the best guys to stash and see what happens.
John Ursua - I was big on this guy preseason as the Doug Baldwin clone/replacement for Seattle. Pretty surprised he hasn't been really been active and that they haven't given him a chance, given how good he looked in preseason. On the other hand, it's hard to get much opportunity in the Seahawks passing game if you're not Metcalf or Lockett so there isn't a great path to fantasy value here. He's also old for a rookie. Just one to watch due to the talent and the fact that they did trade back into the draft to get him.
Jazz Ferguson - Probably too much of a longshot, but I was pretty impressed with him in the preseason and if the Seahawks move on from Moore (and Gordon), there might be something here (assuming he's still on their practice squad - I'm not sure).
Mo Alie-Cox - Ebron and Doyle are FAs next year so he might have more opportunity. I used to be higher on him, but the Colts haven't seemed too interested in developing him as a pass-catcher so my enthusiasm has cooled. Possibly worth the last spot on your bench though to see what happens.
Jordan Thomas - Like Alie-Cox, I've cooled on him a bit. Has some legit receiving talent and quick feet in a massive frame but it looks too crowded in Houston (even without Wharring) for him to emerge as anything more than a bye week dart throw. Still, might have more upside than someone on your roster currently.