For Poker (Texas Holdem) I highly recommend
PokerTH. For Solitare, what's wrong with "Patience" that comes with Slackware? It has many Solitaire games including Spider, Golf, FreeCell, and many more. TkHearts is another nice program if you want to play hearts.
Both PokerTH and TkHearts can be played without installing anything and as I said Patience should already be installed.
Edit: Ooops I just realized that you did not install KDE, so you probably don't have Patience. PySol might work better for you then. Ace of Penguins might also be worth checking out. Finally, there are more Tkgames such as Tksol that you don't have to install. See
http://tkgames.sourceforge.net/.