You could also roll your own image. Not only can you then include samba and other packages (and save yourself having to reinstall them after an upgrade) and some default config files, you can also increase the rootfs size as you see fit.
This can actually be done without a full-blown build system and compiling the whole image from scratch, it is also possible just with the "simplified" image builder. Once you downloaded and ungzipped the image builder, edit the .CONFIG file and change CONFIG_TARGET_ROOTFS_PARTSIZE, which by default is now set to 104, to whatever size in MiB you prefer for the rootfs.