Anyway, there have been many posts on quick and easy alterations of dobro open G and D tunings, but I haven't seen any posts like this for C6. I'm sure they're out there, though, so I thought I'd ask what folks here have tried. Here's a couple variations I've had luck with without changing my usual C6 string gauges. All are spelled low to high.

CEGBDE
These intervals are the same as what many use on the bottom of a C6 8-string tuning (with an F on the bottom). I really like this one, and you only need to retune two strings. Not so many extended chords like the Leavitt, but straight bar gives two different major triads (without moving the bar), a minor, a major 7, a minor 7, a 6th on top, and some nice sounding dominant 7 fragments. Plus an easy string pull behind the bar on the top string to make a full dominant 7.

CEGACF
Yields some similar chords to the above but with different inversions, plus a churchy sounding sus4. Nice 7th on the forward slant on the top 3 strings.

CEGAC#G
A "reverse" Jerry Byrd with the high C raised instead of the low. Really the same chord options as the regular JB, but it keeps the strings grouped in two pairs of 1,3,5. A forward slant makes a major chord across all six strings.

BbEGACE
An abbreviated Jr. Brown? I don't care for this one on the 6, it works much better on the 8.

I left out traditional JB C6/A7 and the Leavitt, but those sure do work well also without buying new strings.

I find it's better for the kind of stuff I'm more interested in...jazz & blues. But it is also good for C&W and swing using slants.
I like having the lower range, so I chose to sacrifice the high 3rd(E). I sometimes raise the lower strings up a half step for some variations: A#CEGAC or AC#EGAC or ACFGAC.
I recently played a bluegrass gig using this tuning on a resonator guitar, and nobody was any wiser.

As a pedal steeler primarily, I'm more interested in the single note voice of this non pedal axe...ala Toots Thielmans, Stephan Grappelli etc. , but there are alot chord fragments to be had. Having this tuning is also a great practice instrument for the inside 6("home row")of my C6 PSG. Someday soon I really do wanna get an 8 string though.

I was sure some of you experienced folks might have some other interesting tuning tales that wouldn't involve changing the C6 string gauges, though. For entertainment purposes only.