Seeing the color profile those images come with, guessing from some version of PS
I can not think of any easy way(s) in Gimp, but then I am not an artist. My stab at it.
The pink swirly thing might start life as a circular selection, painted in with pinks then the iWarp filter applied. It is a very sensitive filter however, not easy to use.
The grungy image? Very hands on. Build up from layers, texture can come from the old Gimppressionist filter.
I can not think of any easy way(s) in Gimp, but then I am not an artist. My stab at it.
The pink swirly thing might start life as a circular selection, painted in with pinks then the iWarp filter applied. It is a very sensitive filter however, not easy to use.
The grungy image? Very hands on. Build up from layers, texture can come from the old Gimppressionist filter.