Is it possible to verb anything other than a noun?
Although slightly meta, I noticed that English SE has verbing as a tag, rather than verbing-nouns.
Yes, you can for example verb an adjective.
Verbing weirds language.
Garner's Modern American Usage has a nice discussion of "Adjectives as Verbs" under the heading Functional Variation. E. Garner warns that these transformations often have a trendy or jargonistic quality but adds,
There are exceptions (greening rooftops). And to copyeditors, it is natural to talk about lowercasing and uppercasing words.
Several adjectives for colors have been verbed.
In addition to the recent use of
greening (in the environmental sense), there's the
yellowing of paper. We also
brown foods, such as ground beef. Interestingly, we
blacken foods; we don't
black them. And we
whiten clothes and teeth. Rounding out the colors, people have
Came across an example of someone smugging for the camera today, which is a beautiful turn of phrase in multiple ways: the verbing of an adjective, plus the parallelism with mugging, which conveniently already means something similar (and was itself a result of verbing a noun).