I found these years ago, possibly in Berlin. All three are labeled with the Melodiya logo. The blue one is easy listening instrumentals, label in cyrillic. The yellow and and the red one are from the GDR youth magazine "Frösi". The yellow one contains songs from the FDJ (the official GDR youth organisation), among them the infamous (yet catchy) who-is-not-with-us-is-against-us hymn "Sag mir wo du stehst" ("tell me where you stand"). The red one is a feature about the conquest of the Kosmos.
All run on 33 1/3 and are double-sided.