I'm looking for a set of examples to illustrate the relation of temperature and color of "glowing" bodies.
It should allow to build an intuitive understanding of this relation, so it's not about spectra, but just color in terms of visual appearance.
The examples should cover infrared to somewhere above visual light if possible (or reasons why it's not possible).
Some good temparature/color-relation-examples froom comments/answers:
An example for about 2500K could be a tungsten wire of an incandescent lamp.
It is not a good example because the wire in gas is not a good model for a black-body, as C. Towne Springer explains in his answer.
He provides an an electric kiln as an example for about 1400K giving very good black-body approximation.
As said, it's about the illustration, not about perfectly matching the spectrum of a black body - "similar enough to look the same" would qualify.
From Robin's comment, the sun could be good as example for about 5800K.