Your second pic is of a 9mm Front hub and skewer, where as pictures 1 and 3 are of 10mm rear skewers.
If you are planning on getting new or new to you wheels you may want to concider something that is also going to be able to be converted into the other 2 main front and rear standards as well, these being
Front Hub Standards
Standard QR -5mm
9mm QR
15mm QR
20mm QR
Rear Hub Standards
Standard QR – 5mm
10mm QR
12mm QR
There are a number of hubs on the market that would allow these, the most common ones are Hope Pro 2 hubs. By getting wheels that can be adapted easily to all the curent standards should allow you easier upgrading of other paerts in the future.