If you are worried about the size of aliases, you might consider to use symbolic links instead - that depends on what you want to do with your references to the files instead.
Apples alias tend to be large, even if no large icons are included - symbolic links are always small.
If your original file has a custom icon, the symbolic link's icon will have that icon too.

Compare the sizes of the alias and the symbolic link - the alias has a huge file size compared to the original file, a symlink is much more economical, and even does show the custom icon.
You create symbolic links from the Terminal,
type
man ln
into the window to see a manual entry how to create symlinks. (ln is short for: link)
The short form of the "ln" command is
ln -s path to the file to be linked path to the symlink to be created
for example:
ln -s map.png map.sym
will create a symlink called "map.sym" to the file "map.png" and place the link into the same folder as map.sym.
See A brief tutorial on symbolic links: http://hints.macworld.com/article.php?story=2001110610290643
Regards
Léonie