Pastal colours (pink, aqua, yellow, purple) - These colours are quite feminine and attract a female audience. They're bright and work well together because they're often split complimentary opposite colours.
Packaging Egg Box - No, it isn't software exactly. But it is a great example of a design that works well at revealing the beauty and nature of the content to the user rather than hiding it, which is what UX design ought to do more.
Self promotion idea. OK - no beatng around the bush - this is a serious portfolio - but this may be your competition - so what you may lack in money for a portfolio - make up for it in creativity - see all my suggestions on my Self Promotion Idea Board.