Slightly off topic, but I listened to all four of the solo albums at work this morning. You can certainly hear echoes of the band's songwriting in all of them except Peter Criss' effort, which is just dire IMHO.
I'm aware he's known as having 'jazz' roots, but that album is getting deleted from my downloads. I think Ace's album is probably my favourite, followed by Paul's, then Gene's, but there's not much in it.