I'm not at all sure why either of these PHQ stamp cards should have pink as the predominant colour, but it's very convenient for me that they have.
The first is from a 1978 issue about energy (maybe the pink is caused by pollution in the atmosphere?) and the second dates from 1981. This one was part of an issue marking the 25th anniversary of the Duke of Edinburgh's Award scheme, a scheme run for young people to develop skills in various types of activity. These activities have changed a little over the years but in 1981 the four areas were Expeditions, Skills, Service, Recreation.
PS, in spite of the post's title, I don't think either of the stamps are pretty or attractive at all.
This is a post for Sunday Stamps, now hosted by Violet Sky at "See it on a Postcard!"