The out-of-the-box DIYLC grid color gives me eyestrain so I hunted around a little and found out how to darken it. You have to modify the main app's config.xml file, so make a copy of the file first, and Do This At Your Own Risk!. If you totally mess up, and don't have a good backup copy of the config.xml file, you'll have to reinstall DIYLC.
If you know how to specify colors using hex RGB codes, you can get creative. If you don't, just edit according to the instructions.
1. Go to the diylc application support files folder, and make a copy of "config.xml" On my Mac, this folder is in "[DiskName]/[MyName]/diylc." On Windows, I do not know. You'll know when you find the right DIYLC folder, it has two subfolders: "logs" and "backup."
2. See #1. Do not proceed until you have a copy. If anything goes wrong, you can delete the file and reinstate your saved copy as "config.xml"
2a. Do not change anything else in this file or DIYLC may not work and you'll have to reinstall.
3. Open the config.xml file with your favorite XML/text editor. Search for the word "theme." You should find a section like this:
<entry>
<string>theme</string>
<org.diylc.core.Theme>
<name>Light</name>
<bgColor hex="ffffff"/>
<gridColor hex="c0c0f0" alpha="f0"/>
<outlineColor hex="000000"/>
<dotColor hex="c8c8c8" alpha="f0"/>
</org.diylc.core.Theme>
</entry>
4. The line to be edited comes this way in the default setup: <gridColor hex="f0f0f0" alpha="f0"/>. The line is highlighted in blue above.
5. Change it to read: <gridColor hex="c0c0f0" alpha="f0"/> Right after the 'hex=', change the initial "f0f0" to "c0c0", leave the trailing "f0" alone. After editing the line should now read: hex="c0c0f0"
You do not need to change the [alpha="f0"] segment. The only characters to be changed are highlighted in green above. This will darken the pale blue lines to a darker blue. If you want it darker still, repeat but change the "c0c0" to "a0a0."
6. Double check your work. [You do have a copy, don't you?]
7. Save the file. Close and reopen DIYLC.