  We build a set of composite galaxy SEDs by de-redshifting and scaling
multi-wavelength photometry from galaxies in the ZFOURGE survey, covering the
CDFS, COSMOS, and UDS fields. From a sample of ~4000 K_s-band selected
galaxies, we define 38 composite galaxy SEDs that yield continuous
low-resolution spectra (R~45) over the rest-frame range 0.1-4 um. Additionally,
we include far infrared photometry from the Spitzer Space Telescope and the
Herschel Space Observatory to characterize the infrared properties of our
diverse set of composite SEDs. From these composite SEDs we analyze the
rest-frame UVJ colors, as well as the ratio of IR to UV light (IRX) and the UV
slope ($\beta$) in the IRX$-\beta$ dust relation at 1<z<3. Blue star-forming
composite SEDs show IRX and $\beta$ values consistent with local relations;
dusty star-forming galaxies have considerable scatter, as found for local IR
bright sources, but on average appear bluer than expected for their IR fluxes.
We measure a tight linear relation between rest-frame UVJ colors and dust
attenuation for star-forming composites, providing a direct method for
estimating dust content from either (U-V) or (V-J) rest-frame colors for
star-forming galaxies at intermediate redshifts.
