Nokia allowed people to receive 72x14, 1bpp pictures over a series of binary- or hex-encoded SMS messages, and have them show up instead of their carrier name on the home screen. In the 2000s, magazine ads and webpages would distribute them using premium-SMS.
This service, also featuring ringtones, games etc. has been revived, free of charge, by MtF hacker @Manawyrm@chaos.social of the Chaos Computer Club. You can go to Blåmba.de and download all kinds of content into your retro phone.
The service has been discussed in detail at her 38C3 talk: media.ccc.de / YouTube mirror
I also made 10 logos mostly related to Blåhaj, these are already in the Blåmba logo repository.
I welcome feedback and suggestions for future logos!
What a nostalgia trip. I love it. I owned and used 3310 for several years back in early 2000s.
~~How did you end up drawing all of these? Do they serve a purpose or was it just an artistic pursuit?~~
OP has already provided details in the post description.
The 3310 and other 84x48 LCD models are special in that they use a non-square pixel aspect ratio, approx. 7:8. Logos in green were designed for such phones and will look vertically squished on color screens, and vice-versa.