marianne: Golly...I sure do appreciate your input. I naturally have been wondering and curious re 8.1. Not too many folks have 8.1, so info is not easy to come by. Re tiles, metro's tiles (the ones I've kept and not uninstalled) are pink, yellow, pleasant colors. I dislike orange...UGH ! My tiles are smaller than metro's and are blue. I have not created a custom tile from a desktop icon. Hmmm, I'll have to try that and see what happens. The game tiles I have on the metro screen, just automatically appeared once I uninstalled most of metro's tiles and there was room left on the screen. Guess my PC or metro thought it best to fill up that screen with something !!
I think the metro screen is essentially the same as the start menu, just with a different look. If you install a game or program that would normally add an entry to the start menu, it should add that entry to the metro screen instead, although (thankfully!) most of them are hidden on that second screen that is just as chaotic or probably even worse than the old start menu used to be. So that's probably where your game tiles come from.
If you right-click on a shortcut on the desktop, there should be an option to "attach it to 'Start'" or something like that. If you do that, it will appear on the rightmost end of your metro screen (you may need to scroll there). And it will probably look just like your other game tiles look. As you said, in Win 8 all these custom tiles have the same blue color, which is neither particularly pretty nor particularly bad. In Win 8.1 they have varying colors (blue, green, grey, red, orange etc.) but you will have no influence on which ones Windows will choose (except maybe by changing the shortcut icon). If you use OblyTiles to customize your tiles, it doesn't really matter, but that requires a lot of effort.
Check out the screenshots below for an example of 8.1's default color scheme and an example of customizing the tiles with the 3rd party tool OblyTiles.
marianne: Question: If I upgrade to 8.1 and don't care for it, can I easily go back to 8 ?
No, going back from 8.1 to 8 is not easy at all, you may have to completely re-install Windows 8. There might be alternatives for more experienced users, like creating a recovery point or something like that, but no guarantees. Once you've updated to 8.1, you can't just de-install it again.
marianne: And have you used 8.1 with your games ?
Yes. Almost all work fine and just the same as with 8. If I recall correctly, I might have had issues with one or two games after updating, but I was able to solve them.