Well, here's my just under the wire entry...
My goal was to create a sonic with design elements from both the tenth and eleventh Doctor Sonics, without feeling too derivative of either.
Further than that, I tried to keep in mind the true purpose of a sonic screwdriver (at least according to my DK Visual Dictionaries); as a multipurpose tool for diagnosing and servicing the TARDIS, including areas that would otherwise be unreachable in the depths of her inner-workings.
Up top, we've got an aluminum (aluminium, for those in more civilized countries) 4-strut cage design inspired by the 10, but which extends 3.5mm to reveal an inner core like the 11. When extended, the blue core is lit up, even if the Sonic is not activated (this is to simulate some sort of read-out, in keeping with Matt Smith's method of usage).
Below that is a brass section engraved with Gallifreyan text. (Operation instructions, perhaps? We may never know).
Below that is a button. For me, the inclusion of a button was more than just a real-world operational necessity; it's a very deliberate design choice. The modern Sonic Screwdrivers have been designed to not have an activation button. The button is for the actor's use, not the Doctor's. while I can accept psychic setting selection, I feel like he should still have to push a button to implement it. Because I feel that a buttonless device that's been manufactured by the TARDIS is contrary to the design of the TARDIS; she's a ship whose instruments are cobbled together and ramshackle. She's a time machine with a manual typewriter on her console! Thus: it only makes sense that the Sonic Screwdriver should have a manual aspect to it as well. Also, despite the fact that the modern Sonics are supposed to be buttonless, the button ends up on screen anyway, so why even try to hide it?
As we transition to copper, you'll see that the top of the handle section slopes down to where the button is. This allows the button to be found quickly. Further, the top section of the handle has a small gap before the rest of the handle... This was my nod to the classic design Sonic Screwdriver... Pulling back on the lip of the top ring pushes the top ring back toward the rest of the handle section and extends the sonic, which is spring-loaded.
Then the rest of the copper section is ridged for a better grip, and another nod to the design of the 10.
Below that are three settings rings with a ribbed edge (like a US quarter). These are for fine-tuning settings, which results in a sight pitch change when adjusted. These are aluminum or steel.
Below that is the end cap. It is black. It does not contain a pen.
Hope you guys like it and best of luck to everyone. There's a lot of really great stuff here.
***Edited because I forgot the brass collar around the central core. Added it in real quick
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