you can check
www.boardmod.org for some templates
but they are made for YaBB 1G, they'll still work for YSE, but you'll need to add some extra css there
a better way than copying the entire template from that site is to copy only the color codes, that way your YaBB SE template remain the same, besides the colors
some button sets released for YaBB SE also come with a template. You should
check A.M.A.'s button sets, they usually come with nice looking templates.
Last, but not least, if you're still using 1.4.1, I highly recommend you to upgrade to the latest version (1.5.4)
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