Ah, those pictures bring back so many memories of childhood in elementary school.
I consider myself lucky to have grown up through the prime of the personal computing and internet revolutions, as well as have been exposed to Apple's 1998 metamorphosis and the PowerPC Golden Age... before iPhones, iPads, iWatches, and other nonsense.
The two computer labs in my elementary school each got 266mhz iMacs as did each classroom. For some reason this happened during the school year rather than over the summer. The teachers' iMacs with an external ZipDrive, hah. In the classroom everybody fought over getting to use the iMac vs. the older two computers, usually Apple Preformas and/or AIO PowerMac G3's. Some classrooms still had some LC II's hiding in the back with black and white screens! What color iMac your teacher got was all the talk of the playground for quite a while. My teacher had an Orange one.
My computer teacher, Mrs. Fienberg, had to create a seating chart for the computer lab because everyone was so picky over what color iMac they got it would turn into mayhem. Boys never ever wanted to get stuck with purple ones. I was lucky that year because I got a Green one, which was considered very cool. Certain colors were clearly better than others for reasons beyond aesthetics that only a 9 year old could understand.
This was a huge oversight by Apple. It caused many arguments amongst 2nd and 3rd graders and their teachers. But besides that issue, Mac OS 8, AppleWorks/Claris Works, Turbo Math Facts, Sim Town, Mavis Beacon Typing, and The Oregon Trail ran so much smoother on the new iMacs. They did not have Glider installed though (best classic mac game ever!) The iMacs were great for surfing the "net" aka "the world wide web" using programs like Netscape Navigator or later Windows Explorer. Popular search engines like AskJeevesKids.com, Yahoolagins, and Alta Vista were utilized. I could log into my files by using the AppleShare by "going under the apple". We were assigned passwords in 1st grade. The theme of my specific computer class' passwords were "dog names". From first grade through the end of 8th grade my password remained "Oliver". Apparently Oliver is a dog's name?
The server in the school was a Blue & White PowerMac G3 400MHz. Shortly after the iMacs, they purchased two carts ~25 Orange and ~25 Blue Clamshell iBook G3's. The administrators had PowerBook G3's. They had airport! Most kids had to have a lesson on how to use a trackpad. I remember a few kids wondered why there wasn't one of those tracking nubs in the middle of the keyboard like IBM laptops still (might) have.
In middle school they got new iMac DV's and SE's and white iBook G3's. The G4's then came into the mix- eMacs, iMacs, and PowerBooks leaving the colors behind.
Actually while I was in elementary and middle school the computer labs at the high school in my town had Dual Processor PowerMac G4's 450's with 17" Apple ADC CRT's replaced a few years later with Dual 867Mhz Processor Quicksilver PowerMac G4's with Apple LCD studio displays. Back then, those were insanely powerful computers. By the time I got to high school they had switch to PC's and somehow I got stuck having to run photoshop and indesign on a painfully slow Pentium 4. Then I transferred to private school and had to buy a laptop so I got a super powerful brand new 1.33Ghz PowerBook G4 12".
I hate to say it but I think the colors are gone for good. Or at least a very long time. It's all about the brushed aluminum, glossy glass, and not colorful plastics.