ACP 
ACP’s GridMAX grid covers simply snap onto the face of old or damaged grids. Grid covers eliminate costly facility downtime for demolition and replacement. A low-cost alternative to replacing or repainting rusted, stained or outdated metal grid, GridMAX works on 2x2 or 2x4 grid system. Install for a fraction of the cost of grid replacement.
ReCeil It International 
Renew existing aged or discolored ceilings. Ceilings tiles, grid systems and vent covers are transformed back to a clean and bright surface like they were when new. Sound absorption, light reflectance, and fire ratings are not harmed. Consider the recycling of tiles and grid when working on LEED® projects.
4specs Discussion Forum - Great place to ask questions about specifications, products and technical data. Free - no registration required to read or post (subject to moderation).
See also: Ceilings for other design options
ACP
ACP’s GridMAX grid covers simply snap onto the face of old or damaged grids.
Grid covers eliminate costly facility downtime for demolition and replacement. A low-cost alternative to replacing or repainting rusted, stained or outdated metal grid, GridMAX works on 2x2 or 2x4 grid system. Install for a fraction of the cost of grid replacement.
ReCeil It International
Renew existing aged or discolored ceilings. Ceilings tiles, grid systems and vent covers are transformed back to a clean and bright surface like they were when new. Sound absorption, light reflectance, and fire ratings are not harmed. Consider the recycling of tiles and grid when working on LEED® projects.