Does anyone know where I can find the options for texture in bsetroot for flux/blackbox? The bsetroot man says they're in the blackbox man but I couldn't find them and search for gradient came up empty.

bsetroot only applies gradients and colors to background for images use bsetbg

That's what I'm asking about. Options for the gradient switch.

This is from the bsetroot man:

-gradient texturestring
Renders the specified texture string to the root
window. For possible texture strings, please refer
to blackbox(1). You must also specify both a -from
and a -to color.

I refered to blackbox(1) I searched for gradient and came up with nothing. I also searched for texture and only found it once, and it had nothing to do with bsetroot.

I know the option works. For example:

rootCommand: bsetroot -gradient interlacedgradient -from green -to black

will set the background to an interlaced gradient from green in the upper left to black in the lower right. I would like to know what options are available other than interlacedgradient.

I had the same trouble not long ago....there's nothing in blackbox manpage to help. Eventually I decided to look at the styles included with the window manager and found what I was looking for there. For example:
rootCommand: bsetroot -gradient flatcrossdiagonalgradient -from rgb:4/6/8 -to rgb:3/48/6