Those being cremated can also have their ashes made into a glass keepsake or piece of jewellery ... although that's not a particularly inexpensive way to dispose of your remains!
https://www.cremationsolutions.com/cremation-keepsakes/cremation-glass-keepsakes-and-urns/In all seriousness, I just wanted to add a cautionary note for those in the "flush me down the toilet or put me in a coffee can" camp. I get the desire not to have an extravagant and unnecessarily expensive funeral, and I do know that sometimes people get talked into things they don't need or even really want, because they're in a heightened emotional state. I'm also in agreement with the environmental concerns either of cremation (fuel use) or traditional burial (taking up space that I no longer need).
But we have to remember that funerals and similar rituals are not totally for or about the person who has died, or about the most efficient disposal of your body. They're also a means by which the people who are left behind come to grips with the death of someone they loved, and a process through which people can come together and support each other at a difficult time.
I'm an Anglican priest, and the daughter of an Anglican priest, and the sister of someone who works in a crematorium. I've been around a lot of death, and can say that having the opportunity to minister to a family in grief is the most important and fulfilling thing that I do. I'm not in it for the money (most definitely!) and in fact it is a huge amount of work on top of my day to day, but I love meeting people and serving them, and get a lot of satisfaction from it. And most of the people I meet in the funeral home industry seem to feel the same way.
There is a cost, and it is a service, so money does play a role in the interaction, but in my experience over the last 5-6 years, I've never personally seen someone be deliberately manipulated or taken advantage of, even at my non-preferred funeral homes. Families tend to come with a pretty set idea about what they want, and don't deviate much. Planning a funeral is a bit like planning a wedding - you can have a very meaningful process that doesn't cost a lot, or you can add every frill and spend a lot. For example, people in my church, who are mostly of Caribbean heritage, tend to have a focus on the "repast" (reception). It's an important part of their mourning process - to come together for a big feast in honour of the person's life. I've also seen funeral homes work very hard with families to find the least expensive options that will still honour the families sensibilities of what the ritual should look like.
There are exceptions to every rule, but in my experience the families that try to skip over the basic rituals tend to be the ones that are least emotionally healthy. In my opinion, there should be opportunities to gather - which could be simply at the graveside, depending on climate/time of year, or in someone's home. There should be "words spoken" - religious or not - that reflect the fact that life has changed forevermore for those left behind. There should be freedom to cry, and to laugh, as you remember the good times and bad. There should be dignity.
Again, this is all just my opinion, but it's opinion formed from working with grieving families. People who are very vulnerable, and often with a number of people involved in the planning, who all have varying ideas, opinions, and emotional health. IMO, there shouldn't be coffee cans or toilets involved. Not because you will care. You won't. You'll be dead, and won't have to see someone you love reduced to that state. But because of the people you'll leave behind, who will want to remember your life with beauty, not trauma.