I like the colors but was the vignetting is a bit much, especially in the second one. Actually, it's not even that it's a bit much as the fact that it's so... round. It keeps my eyes going round the photo. Other than that, I do really like the look.
3 new layers - one yellow in multiply mode, one pink in screen mode and one blue in screen mode. I just googled GIMP tutorials. Then played around with the colors and opacity until I liked it.