Use wood and mechanics for the retro layer
A wooden digital clock, walnut tones, brushed metal, clear acrylic, and visible mechanics establish retro futuristic decor more reliably than a generic filter. Repeat one or two materials so modern hardware and older references belong to one system.
Let an RGB LED clock provide the future layer
An RGB LED clock, floating numerals, and soft backlighting add the futuristic accent. Limit the palette and reserve the brightest color for the focal object so the setup does not compete with the screen.
Utility keeps the setup intact
A clock, charger, or speaker is more likely to remain on the desk than decoration with no daily role. Give each object a fixed place and leave enough access for cleaning, connecting, and changing settings.
Common question
Does a retro-futuristic desk need neon lighting?
No. Clear construction, layered numerals, mechanical movement, and contrasts between wood and metal can express the same idea with less visual noise.